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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd209982ae73e3616ce5211724bce9829aac052f4e797c318c8289eef3655f3' 
  AND token = 'Qn1V8T5fW2IlAYeFeo/KVmBgGPa/DeJJ0HtRQ/KFmZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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