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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e931e41e24c96c28ed0d383cf5c792b082b8f12c43841194df8dc405a8287233' 
  AND token = '33Xpu2XhskV68mbg1mQ5avpLVfyo7VYK5ON5PVvAG0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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