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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb98f8fa4b2e7e1cd07a4499034a84b5debb37ac1a987d3386816d856cbce5b' 
  AND token = 'rFwVWYs4bnIJYzsntMKMA89QZpT/1JWYtq4GWNcRrvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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