Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a66488cf3e2c2bbe11034bbae3d10fa272fc8782623590391a07506d957aee1' 
  AND token = 'Y63lQL2lA2N65Z+XfFQib1ZPc47NHAbZVDKxvUIGJq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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