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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ce4c958547cc6b331550ca60b61c04f3cdb315cc07070eba68b86dc90d5633' 
  AND token = 'YL2cx/x8/GiS4i4qQ+A4/22CGzLgecKmD3k5IiXptWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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