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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927a25354693f9f8d224d3e89302f209bb6453d19a70e404843da03a80de086a' 
  AND token = 'Ukdp63OSqWJkihsQ/pl0hGRX4Jgdhdkco8Dfbn87uyw=' 
  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"
    }
  }
}