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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f021965f9acee892be7d5230efcbb59e901b6d5b9077c99cc7e50dea7de2ef6' 
  AND token = '9qHS4skw4go2SHgV3TkOKeqKd5zUv27XPaJUPlayaDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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