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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1caf27efab9f8b343280e79aaf23712c9482d04882a4a14a6804883f0121fa' 
  AND token = '/pqF8h3cQ+/tqgJeIe6L/BIbL5PKi9eSwoSJAguMdh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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