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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5682cc1c29743a0b4cc1f81e20e743b55b0c78a9b2bdda8c559d7a1d1bbdb7' 
  AND token = 'kNaYW/vTDzgSW9Kh3WKvrOYDuw5mNp/oymFjhrcovb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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