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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a7af6593affe80d2e5110bd4eebe4f8bbb41fc3b8e4b0e6ff49cdc37d81dcb' 
  AND token = 'OaKu7fOgKepB77aqQDXF9AhmyJIpmkaUUJDdirZfZw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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