SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6276d3c31779e3d99d4c9bc6e1b9b57e00196d8c40bda94fe55b18f8898224c1' 
  AND token = 'g3EKivnAVIbASdX0s8aaC8Wp3S3hfjJPr9Gu/YwgHrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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