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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e220cea81f2e724a32a55dc4544fe2b105222f9f7564f74c35e096800a72ad17' 
  AND token = 'T9GGeuUls/hbEK9igvKjE3HQ1wKpkox7J3ot8R5MFJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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