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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506c74d82948064b959b4103e1099e5b4965ce38f512cc811f84dbc6fb515a8f' 
  AND token = '4XYD8YHayRjVTOL5EDLrLcphI1r93fIr9njjUwwSPJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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