Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6718d504881af1ef3518bd9d90cdb0dfe2b006127794118353bce63153d701d4' 
  AND token = 'M6OIVOW/i4kyzYEgvImFWAc/NCR46Z31iFXvRphshCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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