SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfbf14ac096720fc67abb87223c0c279b2de95e7d005bedfd77faa646d88536' 
  AND token = '+tBPOCwPmgx+2vIIodhqdlanrz7Sq1xWUoGlYpgzbMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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