SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5886e743915c7615fc452a99b3fab69897c52ca0fdb156ddbfbb1720590053' 
  AND token = 'adoNGhhOjKKp/bRiBrEwT3C+GZXmBNOMxN1wDBoXQ4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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