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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0afee2621f1fa34bc00cc1618f337e3c995c4d4965d02a67491bd69956e84d' 
  AND token = 'rL15cwWRwG65rm1HZYutP2uLOoHuyL1KUDpmwodGuTg=' 
  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"
    }
  }
}