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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ee95545c5dc6db34895f28cdca6429174e065fc38245c2684ab10594657c5e' 
  AND token = 'pIzgYgnU3Fqutq6r3+cNP1nMEnrQS+5GjP0J20POGYU=' 
  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"
    }
  }
}