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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21488c578299e5dc5a4ff8feedf712aacfba26db94a4471c3f17fcd46b8400f' 
  AND token = 'tjCp+hPK6zId5n5z6xfFDo62zFN/3xYalT3+jJw0Opo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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