Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b55c20543fa7a4565602f90c0ae59bd0c73e58f7a2511891b9596db2112c8ab' 
  AND token = 'WHghL9m0JYsLuTp59dhhnG66g8Alhryhe/vS3Me004s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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