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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ab18bd5dd4c7742a0ba45e4263cf8dcd84089f45cff58ed8b79b06eb85eec4' 
  AND token = 'OkYNFA3WnR4AaHmeJsR9Do3G7pt9M9D8gfOCUYKLt9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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