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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9187dd863cb867572489da481168307e4ffaa95e03d992cc3e593aaf24a76378' 
  AND token = 'JBQv17CRTmNHncWdDAHvZ3kmg5HYPEH9R4l7MMjgW1Q=' 
  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"
    }
  }
}