SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80da402c363fee3059316d9cc2b62aeefd5599cdf7c0da25a703e23febdb19f9' 
  AND token = 'jhzXBYfv3P8wLjdf3oALuqRAHzjwGIDz8DCRrowJKi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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