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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4564d8bf064da4d5e43adda4d90354ef6a77cb2d462b8d160f3eec7dbe2ff1c4' 
  AND token = 'o3ujkOeSOSz3WonWaOG7884rg8bIx/BrvTIjH++Zi0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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