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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b41c361d490e7b06effeae7f2e861ef0c81c872f4de963015fc1270c1d8061' 
  AND token = '+jQsWFKkfyukA3ySZwcrkbMmUP02sJ4ii1pwdxbBDtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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