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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9c876d9e0655f4a4fe7b917e4233a9d8f529641dbb063cce5b4719b4303d7b' 
  AND token = 'grGyv5os6WvKOj7tkQchAYnUMA9SPEZnUm6P2QcnuXM=' 
  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"
    }
  }
}