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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d741d5fb09ebc2157c73e3f7a7ba6dee1e73cfd6942716c20a24612325d2af2' 
  AND token = 'AQ914bcpb9EbwIrkeNA6nQGKf7o4tL6RF1CE+4cz7EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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