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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7d613816095e8095ff8bed58d99358d0712020542c9f66f3a97362cc6659c9' 
  AND token = 'W27C8Rqcks6Vhz6lY1qF99ADlfhiW5vzmUTypbmGnmg=' 
  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"
    }
  }
}