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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3a3715350f72399fb89de8e4786ad8bc86f591e429c046afcc74b4cf000c23' 
  AND token = 'n5/v/TZl+IbOl7+LvOsooIpp5rRKk4+zlW1LbaA0M4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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