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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477111c614ccf9cc2883c674b1f6fd71bf3681bff45a50ce54980dea37d3ca3f' 
  AND token = 'Zmk3suyFpIK3T9kbCXq3uUulraIK0qP+H161GYVl2nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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