Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5029c6d5c66b5fbf6da9e59c922d0dd82880b1c508d391aaa2fe4ac97257bcce' 
  AND token = 'dBsDPZkBZ/zDRO+KAsCJA+D/Hu7qu9zNgmVflWDdXa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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