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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4a12e161290fcb226749ae4625066a0c317c149bca9f2ed8e6ccc58949c5d9' 
  AND token = 'DafVWHdWCV3iE48x0UbGoHEfv34izIUOsnh5KAQC9MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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