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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f81dc37e3d4532d31a5ef7c8c3c8336024643653e6fb67fbca8c72811e4fc8' 
  AND token = 'LV2BcGQkRQ54uktmwbl/2D/KbRg3eQzITbmyzBnRyVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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