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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff27a814b49c1e32950c43235e45d1109c1fd92ffc705a63c30ee9acd581aa4' 
  AND token = '3DX92zH5wY5hG8IHOChXc1JKK9D3s75RwNqZWsFHbyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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