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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb580dc6fa20d842866125ef99b7d8e0029e1c26e98f76c08c803899e596a70' 
  AND token = 'GBuWtt5M7h+JtZ4qX6Zj0I7CRyFCOSNIODalacaExjk=' 
  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"
    }
  }
}