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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a591e15a6d85df796bb8a791db7b50c9854b1d28b2e2d77628262fede38558' 
  AND token = 'VBiPRLjV1FC17+tYDlCYy6qx86kP0w4q19h7fwjFVfY=' 
  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"
    }
  }
}