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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7605f811c7b3a7aeb087852607131c0bc40a3160df0b958c26106acda1cf77' 
  AND token = 'tdCdOqz1ylZAqQXzcTWTjWeOZSPrG3H48KRtpl+cl4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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