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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e59266b689fbe56a5471fb63c8f10caefc772dbbc9785b6d0d9f8eb70b6507e' 
  AND token = 'hOOzD24C+tIUe0TmsnXnEn0yiHmwP0NSA+K1wc6cqo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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