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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62c7b2504db886148197e57dcec6560881810853f74948aa38ea7162985e938' 
  AND token = 'VfWsL5daoBkhc4OpQT/9Yf5XqDBUj+xbz+PO1HTRrNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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