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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5baa7e9ac81f7bc7678bb302e66e91fd10ab34ca31b3b328a4d4e7fe3efddc73' 
  AND token = 'vXsqo2S9kKquL44txIdaMfo+z/sdMVgp2UYOyECaONU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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