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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1832593a04f0b09c294eb66f32bf28615f06e029d2c95ff44253e3be89b73668' 
  AND token = 'NJn3ccF+LXSN2k/deFiHcWo2e3Yb3KosVCYc7r4nk2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}