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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12818b24b4c6485c15705c6edc49bb04d052245780f2ba02cd6e3ef38fd87c27' 
  AND token = 'CgV5z67fjwIaTtFxt3xcdcl5nyrlDwUoGY/duOXw7I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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