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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4f133e4d06381e5b531ef68ba1320fb757cfb57bc903b3a1b6f080404719be' 
  AND token = 'DsiDaLAhgx0fZE2TPQkJ3R2vT5aIJh6/lDs7cMj9w1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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