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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6dbe04e5968a343c5baee67656e46743c505e81b6fd1f10522be72038b05ed' 
  AND token = 'ax7/ddxJ7W2j6/zVwlSq4o7pcSazQASZT64LcuIaqcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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