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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020ff60d451edca39e2df9bf50c5f9a8a60ef48657d6d8ba8a567a99ef47c33c' 
  AND token = 'x9I6F/A4zx9CV94TLPEGlzfpp3Kou8TSJEDfQwg40T0=' 
  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"
    }
  }
}