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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abed4d68022204ecf988e077b7a6fe11b5c6eb2a5520eb07ab55c874d4f55162' 
  AND token = 'CwQUsAN9+CAiKHBUw8/AEivg1cZjSe5+dDeUEnHTbHQ=' 
  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"
    }
  }
}