SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2576c4f63b748e6e52accfccc92f3b2c00330f08abeb5442ea869cbd755a781d' 
  AND token = 'Bp/9zNk5sjyh+q3Y0ZTmMKkLgRDCRU7r96oUBxGWas0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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