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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3f24f806b43261c38995731545c2913cb3ac4c78648c56fbf200cb8b993b96' 
  AND token = '1zqtZD+tXHnolr/oPac+4CEFu3r4JNEapvlql2F6/cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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