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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ed2972d5a04b0a3a6bbb07c9aafca1bf75c2312f4ee586e546086b343feb67' 
  AND token = '5VzkSTcA8V0rXdQrTyT2yHO4YMntI+Ub0VhAaz/mIaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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