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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a392fe6ac1bdc059ab6f770eb9e1a3cfb6171d1308d15261cbd9e99b4a9c49da' 
  AND token = 'VRUpI/8CbVHZf1V/fUn3mp8bjWAwB5E6SGOL8VnOc7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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