Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c945126c3fc56ee39b085f0fc34a6bc2fde36a38d3c300db27877a1b617f1d7b' 
  AND token = 'BLfnlpUtZgVV3ImjhxBL3rg7mpFuJoLf9ZS8lABoicg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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