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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0f37facfd20053e46f1ac777a04d7d513f2aa0626df8d999a4c93e46e1bb5f' 
  AND token = 'iabNbO2OSoVYKm8lQ9JaXYK2WWhuFcOm9nPmhJyW8wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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