Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac547db2cac848af52e4e2dc4fdcf7a20c4545c3dcf6a6bfe240689886535d4d' 
  AND token = '3d4xno+BGxa9gQUHt7++ef9UB5GLkUzhlb6cx0wegco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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