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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84befe570270939f098e904c9d8ad2d8c76b37592ccbe4dce716832838b458a2' 
  AND token = 'x0Fa1cr8WcSGUi2PmVSx/zstI8hR5lXRP6ijASX6/9Q=' 
  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"
    }
  }
}