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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e822308e1a37941f26e46d59ba277feb43b05fc2b7fc80b11742f1ba494ec1' 
  AND token = 'xfep9G7wD/teLYWBI3qtM0AWsBDPisynaht/xApysRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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