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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28896f453208a276d8a53d0f51f1b6f72ad528f3512dc5531927ca160b6b587' 
  AND token = 'UsuW/SAEv+xlIPKXn41JMcnccD/i2BwU5WQ01wK/DLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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