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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70c5178e9408e905d13d33b26d8046632ce7e3fe80e16b552d52f09430d33e6' 
  AND token = '2x6IqGzanITIQms87DK6U110Jaq1TDkhhfa4hUybl/4=' 
  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"
    }
  }
}