SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9179c1e1463c6c84428d8415bd0582d8912bf3a4405893fead94436314befd00' 
  AND token = 'gpcURLZjZYitdzvm/YPpevJEn9lDL7jDW3Q/VbnsqfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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