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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47522bc807b2d2dc86c642460476faa53353bee831af03f793725d5744ea48fa' 
  AND token = 'rS5CON02J86qWIrt3a+Duu4yFLng5yCJmceaW2PHW0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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