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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac3f10c056ab76cc0e485d4a866d7c0c7ef5d582aaa3bf3b5044ff3f008bec1' 
  AND token = 'x6KaxY8KRrOI0b8Pl5o2M8j9haTOPInrNUDeDkacoQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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