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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4801ba73f5c4d3ad1862259a1b26a962feb1010435e6e170bb0718b5dc1f8b51' 
  AND token = 'BUni0nsj6JBklwrhA7o7iXZv/0lfCQo9KCAjo8RFFMA=' 
  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"
    }
  }
}