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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea73a7fb0a11185cba5cab482a92b2d805fea9d0edc749d7d9f8959b18f259d' 
  AND token = 'FB6yh0BK8xTEy0ctC0j3Osk/eM6zxdcjK8wYD0OiKb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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