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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d88c6ba063f1c709e772ecd3b2bf703a4bcc57493de05554f397c6d136dba06' 
  AND token = 'dnGrkxqK/MDE9wJ01oMAeN7f+B1eCV83MbQxvTOqCjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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