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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96cbead421abeba5b2605e14a67694619fd5768fe875dbfa5311a4f1bff4304' 
  AND token = 'EB8ey62IB69sjKf9Fe4TQINUBya1uugD0B0KoJ+fJxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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