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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69f28009f5ccab8890ab375508feea65e278ee5dce23d9dae5e636535b594b5' 
  AND token = 'AkmxEWwOF9jvgn207Yabtzj1qdjQdTUIYz1G5N7hCcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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