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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bf6ca9b9dfafae9648b01a5c59845070b6d17f7cad3cad1d81b52aeeaf9693' 
  AND token = 'rGFTloO9PlJjqZLi+Xw6BzwsC9ifCk01zND7TiLbTJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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