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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10e9688896170c4eefb5a47aee8d2edb1a562ca3e887c85b8e89fa0f779aa22' 
  AND token = '2HPgisKbDzrgNyhcEe7kKi2OrUYbQnd6DgXhr6N0wzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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