SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b19af220e4870ab80d62c654560bcdcf7c9e3cf297199f49d7321cfcef7756a' 
  AND token = 'ldqzCJYoPcHQH/W6X9nwj7ThYNBR9PC8ukDKPZKOtzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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