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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c3a913f213fbe9c2eabc2a95588a63621f9a08cc561ced497e708fbba954c6' 
  AND token = 'f7eMbde6nOGcwXk3nuThzXIJ+yI0iYbzEGkcYF2gIpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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