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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c803d6f91c1b4d57eb6a7974685a4f6fc61a9bf1ca5586dc86880c0caf1f7e2' 
  AND token = 'u0rJs9ibSQzeUTFIk/k5brBgQ1eTObj3OpvGob3mu0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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