SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd9648ca515b79ff0757f6f89aa4192ba1e4528da84e0838a9e7a73d64dd97a' 
  AND token = 'EA3VvVYiz0aUAb/rSoHsh+SGU0kp+3XhZBhJDNV3SM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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