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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650529d110705fdf93653bc609c0d942950caad1d91e5da91620269a87f0a501' 
  AND token = 'DCHr3UKioogDwPgQIrv//CsFvAnx1zoTpgbM4S4Q0kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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