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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb17a521aa4f4b3f26d0343fbdc1464d8064a4090bfb3a6aa15d577248eb510d' 
  AND token = 'Mhp+omGSobLkOkaYsLcZ8DiXldnlG85C0Ui94cjIe1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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