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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88af5238052fec3fbf1cc4a4bdda1d023fdb9d5dd799f5a49078889119901b40' 
  AND token = 'yFYw9kiWCgEU9qhc2KT3vrDAxjLPtr019Y41zuSWx0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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