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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9da799dcd57cadcc41386b47c676e944926ddc0f187a3991ce7bb0c85c47e1' 
  AND token = 'U8kRivyXcD3UWMZD4tf9qHncAivAEJRQ/3bz5j/o85U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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