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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13df1a8e99654dbd7b643e54c395096a8e93d630c609a541d99d8bbbdcc10658' 
  AND token = 'Zw1zwvyCWOpYgwmxs5S+wQLAwLedJ3Vji5qgOg+D/14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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