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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2942549912b67ac1201b08edd7b9a88fe7e60f9ac56a1fd48d72b49e99b5475a' 
  AND token = 'BBNa1lUb859Pw2i5aliT//iqE0WjCJnsZO/d3NSE7Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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